. >> take ben stiller, he gets attention for his foundation stiller strong by producing hilarious videos. >> matt damon he claimed water. how did he claim water, aquaman? >> consider this, damon talks about water on youtube, 4,000 hits. this video with sarah silverman. ♪ knock, knock ♪ who's that knocking at my door ♪ >> reporter: viral. damon says his strong suit is getting people to care. >> because there's a lot of low-hanging fruit so to speak. th